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*jun25 7402101* IB/M/Jun25/G4007/V8 7402/1
For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL
Thursday 5 June 2025 Afternoon Time allowed: 2 hours
Materials
For this paper you must have:
• a ruler with millimetre measurements • a scientific calculator.
Instructions • Use black ink or black ball-point pen.• Fill in the boxes at the top of this page.• Answer all questions.• You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages.• If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s).• Show all your working.• Do all rough work in this book. Cross through any work you do not want to be marked.
Information • The marks for the questions are shown in brackets.• The maximum mark for this paper is 91.
Please write clearly in block capitals.Centre number
Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.A-level
BIOLOGY
Paper 1 1 / 4
2
*02* IB/M/Jun25/ 7402/1
Do not write outside the box Answer all questions in the spaces provided.
- 1
. 1
The digestion and absorption of lipids involves:
• emulsification by bile salts • micelles.
Explain each of the following.[4 marks]
The importance of emulsification in the digestion of lipids
The role of micelles in the absorption of lipids
- 1
. 2 Describe and explain the arrangement of phospholipid molecules in the cell-surface membrane.[2 marks]
6
- / 4
3
*03* Turn over ►
IB/M/Jun25/7402/1
Do not write outside the box
- 2
. 1
Describe how mRNA is obtained from pre-mRNA.[1 mark]
- 2
. 2
Describe how RNA polymerase joins RNA nucleotides.[2 marks]
Question 2 continues on the next page
- / 4
4
*04* IB/M/Jun25/ 7402/1
Do not write outside the box
- 2
. 3 Figure 1 shows the energy contained in molecules during an enzyme-controlled reaction.
Figure 1
Which expression represents the activation energy (Ea) of this reaction?
Tick () one box.[1 mark]
A – C
D – C
D – C
B
D
- / 4
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